Leviticus 24:5-9

5"You shall take fine flour and bake twelve loaves from it; two tenths of an ephah shall be in each loaf.

6And you shall set them in two piles, six in a pile, on the table of pure gold before the Lord.

7And you shall put pure frankincense on each pile, that it may go with the bread as a memorial portion as a food offering to the Lord.

8Every Sabbath day Aaron shall arrange it before the Lord regularly; it is from the people of Israel as a covenant forever.

9And it shall be for Aaron and his sons, and they shall eat it in a holy place, since it is for him a most holy portion out of the Lord's food offerings, a perpetual due."